Capacitive Proximity Sensor Switch Shielded (Flush)

Feature,Specification Model Number,LJ18A3-8-Z/BY Sensor Type,Capacitive Output Logic,PNP (Positive Output) Switch State,Normally Open (NO) Detection Distance,8mm (Adjustable) Operating Voltage,DC 6V - 36V Output Current, Max 300mA Body Diameter,18mm (M18 Thread) Detectable Materials, Metal, Water, Glass, Plastic, Powder, etc. Wiring Logic (Standard Industrial Colors) Brown Wire: Connect to Positive (+) Power Supply (6V–36V). Blue Wire: Connect to Negative (-) / Ground. Black Wire: Output Signal. Understanding "PNP Normally Open" Normally Open (NO): The sensor stays "OFF" when no object is detected. It only completes the circuit and sends a signal when it detects something within range. PNP Output: When triggered, the sensor sends a Positive (+) voltage through the black wire. To test with an LED (like in your video): Connect the LED's positive leg to the black wire and the negative leg to the Blue (Ground) wire. Key Features to Remember Adjustable Sensitivity: There is a small potentiometer (screw) on the back. You can turn this to increase or decrease the sensing distance depending on the material you are detecting (e.g., detecting water through a plastic container). Material Influence: While the rated distance is 8mm, this is usually based on a metal target. For materials like the paper in your video, the effective range will be shorter (around 3mm–5mm). High Versatility: Because it is capacitive, it is excellent for non-metallic sensing—making it a popular choice for level sensing or detecting objects inside non-metallic packaging.